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Anti-hydrogen embrittlement, high-strength and high-toughness stainless steel bar for fastener, and manufacturing method thereof

A technology of tough stainless steel and stainless steel rods, which is applied in the field of metal material preparation, can solve the problems of plasticity and toughness decline, achieve the effect of improving the performance of hydrogen embrittlement resistance, eliminating the problem of hydrogen embrittlement, and improving the sensitivity of hydrogen embrittlement resistance

Active Publication Date: 2020-06-02
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the strength of the material increases, its plasticity and toughness decrease

Method used

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  • Anti-hydrogen embrittlement, high-strength and high-toughness stainless steel bar for fastener, and manufacturing method thereof
  • Anti-hydrogen embrittlement, high-strength and high-toughness stainless steel bar for fastener, and manufacturing method thereof
  • Anti-hydrogen embrittlement, high-strength and high-toughness stainless steel bar for fastener, and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A 6-ton vacuum induction furnace is used to smelt the steel of the invention after iron washing in the forehearth. A 6-ton vacuum consumable remelting furnace is used for refining, and the vacuum degree of the vacuum induction furnace and the vacuum consumable remelting furnace is 0.01Pa. The chemical composition of the head and tail of the consumable ingot was analyzed, see Table 1.

[0062] After the consumable ingot is homogenized at 1200°C for 24 hours, the billet is opened to 140 square meters by a 4T electro-hydraulic hammer, and the billet is opened by a 750KG air hammer to 55 square meters. Rolled to Φ10mm billet, after softening treatment at 920°C, heat preservation for 40min, and air cooling, one cold drawing with 10% deformation to form Φ9mm, and then annealed at 670°C, heat preservation for 5h, air cooling, and polished to Φ8. 5mm bar. The bar is subjected to high-temperature solution treatment at 950°C×30min, oil cooling, cryogenic treatment at -78°C×13h,...

Embodiment 2

[0064] A 6-ton vacuum induction furnace is used to smelt the steel of the invention after iron washing in the forehearth. A 6-ton vacuum consumable remelting furnace is used for refining. The vacuum degree of vacuum induction furnace and vacuum consumable remelting furnace is 0.1Pa. The chemical composition of the head and tail of the consumable ingot was analyzed, see Table 1.

[0065] After the consumable ingot is homogenized at 1250°C for 24 hours, the billet is opened to 80 square meters by a 4T electro-hydraulic hammer, and the billet is opened by a 750KG air hammer to 59 square meters. Rolled to Φ25mm billet, after softening treatment at 920°C, heat preservation for 2 hours, and air cooling, one-time deformation of cold drawing forming Φ17mm, and then annealing at 670°C, heat preservation for 6 hours, air cooling, and polished into Φ16mm bars. The bar is subjected to high-temperature solution treatment at 900°C×40min, oil cooling, cryogenic treatment at -78°C×13h, retu...

Embodiment 3

[0067] A 6-ton vacuum induction furnace is used to smelt the steel of the invention after iron washing in the forehearth. A 6-ton vacuum consumable remelting furnace is used for refining. The vacuum degree of vacuum induction furnace and vacuum consumable remelting furnace is 0.1Pa. The chemical composition of the head and tail of the consumable ingot was analyzed, see Table 1.

[0068]After the consumable ingot is homogenized at 1150°C for 36 hours, it is opened to 100 square meters by a 4T electro-hydraulic hammer, and the billet is opened by a 750KG air hammer to 55 square meters. Rolled to Φ10mm billet, after softening at 980℃, heat preservation for 40min, and air cooling, cold drawing of Φ7mm for secondary deformation, and then annealing at 690℃, heat preservation for 3h, air cooling, and polished into Φ6.5mm rod material. The rods are subjected to high-temperature solution treatment at 850°C×2h, oil cooling, cryogenic treatment at -85°C×12h, returning to room temperat...

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Abstract

The invention relates to an anti-hydrogen embrittlement, high-strength and high-toughness stainless steel bar for a fastener, and a manufacturing method thereof, belongs to the technical field of metal materials, and solves the problem of low matching degree of anti-hydrogen embrittlement property and high toughness of a fastener used in an aerospace environment. The anti-hydrogen embrittlement, high-strength and high-toughness stainless steel bar for the fastener comprises the following elements in mass fraction: 0.0001%-0.01% of C, 0%-0.10% of Si, 0.01%-0.15% of Mn, 0%-0.005% of S, 0%-0.015%of P, 10.50%-12.50% of Cr, 10.70%-11.50% of Ni, 0.75%-1.25% of Mo, 1.20%-1.70% of Ti, 0%-0.10% of Al, not greater than 1.5ppm of H, and the balance iron and inevitable impurities. The stainless steelbar meeting the comprehensive performance of high strength, high toughness and anti-hydrogen embrittlement property simultaneously is prepared, and the use requirement of the fastener making contactwith a corrosive medium and used for the aerospace environment is met.

Description

technical field [0001] The invention relates to the field of preparation of metal materials, in particular to a hydrogen embrittlement-resistant, high-strength and tough stainless steel rod used for fasteners and a manufacturing method thereof. Background technique [0002] The fasteners used in the aerospace field require materials to have high strength and corrosion resistance under specific corrosive media. When selecting medium-carbon high-strength alloy steel as aerospace fasteners, the bolt surface galvanizing process is generally used to improve corrosion resistance. However, during the electroplating process, the bolt acts as a cathode, which absorbs positive metal ions in the solution, and at the same time absorbs H ions generated after water ionization; hydrogen ions with a small atomic radius can easily penetrate the metal atomic gap and immerse into the metal. After alloy steel is quenched and tempered, a large number of defects are formed inside the structure, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/50C22C38/06C21D8/06C22C33/04
CPCC21D8/065C21D2211/004C21D2211/008C22C33/04C22C38/004C22C38/02C22C38/04C22C38/06C22C38/44C22C38/50
Inventor 宋志刚丰涵郑文杰朱玉亮何建国
Owner CENT IRON & STEEL RES INST
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